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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 22, Iss. 2 — Feb. 1, 2005
  • pp: 315–322

Triplet-triplet annihilation in viscous solutions as an example of non-Fickian diffusion

Pawel Borowicz and Bernhard Nickel  »View Author Affiliations

JOSA B, Vol. 22, Issue 2, pp. 315-322 (2005)

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Diffusion-controlled triplet-triplet annihilation is analyzed in terms of non-Fickian diffusion. The description is based on the second Fick's law with a time-dependent diffusion coefficient. We introduce the time-dependent diffusion coefficient because of the interaction of two associated relaxation phenomena: first-order decay and diffusion-controlled annihilation. The equation for the time-dependent rate parameter k_2A (t) obtained from the model proposed is compared with the standard Smoluchowski expression. The new equation is applied for the evaluation of the kinetic data of the diffusion-controlled triplet-triplet annihilation of anthracene. The limits of the applicability of the proposed model are discussed.

© 2005 Optical Society of America

OCIS Codes
(260.0260) Physical optics : Physical optics
(260.2160) Physical optics : Energy transfer
(300.0300) Spectroscopy : Spectroscopy
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(300.6550) Spectroscopy : Spectroscopy, visible

Pawel Borowicz and Bernhard Nickel, "Triplet-triplet annihilation in viscous solutions as an example of non-Fickian diffusion," J. Opt. Soc. Am. B 22, 315-322 (2005)

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